“Alas! must it ever be so? Do we stand in our own light, wherever we go, And fight our own shadows forever?” – Lord Lytton

WordPress 2.5 still doesn’t have an automatic one button upgrade.
While it’s not a huge deal, since there’s a three step upgrade procedure, it’s still more useful if you could do it in one single step. The plugin, WordPress Automatic Upgrade takes care of that.
And that’s pretty sweet. It even backs everything up just in case you run into some trouble. Can’t get anything better than something that provides backup too.